﻿/*************************************************************************************

   Extended WPF Toolkit

   Copyright (C) 2007-2013 Xceed Software Inc.

   This program is provided to you under the terms of the Microsoft Public
   License (Ms-PL) as published at http://wpftoolkit.codeplex.com/license 

   For more features, controls, and fast professional support,
   pick up the Plus Edition at http://xceed.com/wpf_toolkit

   Stay informed: follow @datagrid on Twitter or Like http://facebook.com/datagrids

  ***********************************************************************************/

using System;
using System.Collections;
using System.Collections.Generic;
using System.Reflection;
using System.Text;
using System.Windows;
using System.Windows.Controls;

namespace Xceed.Wpf.Toolkit
{
  public class PrimitiveTypeCollectionControl : ContentControl
  {
    #region Members

    bool _surpressTextChanged;
    bool _conversionFailed;

    #endregion //Members

    #region Properties

    #region IsOpen

    public static readonly DependencyProperty IsOpenProperty = DependencyProperty.Register( "IsOpen", typeof( bool ), typeof( PrimitiveTypeCollectionControl ), new UIPropertyMetadata( false, OnIsOpenChanged ) );
    public bool IsOpen
    {
      get
      {
        return ( bool )GetValue( IsOpenProperty );
      }
      set
      {
        SetValue( IsOpenProperty, value );
      }
    }

    private static void OnIsOpenChanged( DependencyObject o, DependencyPropertyChangedEventArgs e )
    {
      PrimitiveTypeCollectionControl primitiveTypeCollectionControl = o as PrimitiveTypeCollectionControl;
      if( primitiveTypeCollectionControl != null )
        primitiveTypeCollectionControl.OnIsOpenChanged( ( bool )e.OldValue, ( bool )e.NewValue );
    }

    protected virtual void OnIsOpenChanged( bool oldValue, bool newValue )
    {

    }

    #endregion //IsOpen

    #region ItemsSource

    public static readonly DependencyProperty ItemsSourceProperty = DependencyProperty.Register( "ItemsSource", typeof( IList ), typeof( PrimitiveTypeCollectionControl ), new UIPropertyMetadata( null, OnItemsSourceChanged ) );
    public IList ItemsSource
    {
      get
      {
        return ( IList )GetValue( ItemsSourceProperty );
      }
      set
      {
        SetValue( ItemsSourceProperty, value );
      }
    }

    private static void OnItemsSourceChanged( DependencyObject o, DependencyPropertyChangedEventArgs e )
    {
      PrimitiveTypeCollectionControl primitiveTypeCollectionControl = o as PrimitiveTypeCollectionControl;
      if( primitiveTypeCollectionControl != null )
        primitiveTypeCollectionControl.OnItemsSourceChanged( ( IList )e.OldValue, ( IList )e.NewValue );
    }

    protected virtual void OnItemsSourceChanged( IList oldValue, IList newValue )
    {
      if( newValue == null )
        return;

      if( ItemsSourceType == null )
        ItemsSourceType = newValue.GetType();

      if( ItemType == null && newValue.GetType().ContainsGenericParameters )
        ItemType = newValue.GetType().GetGenericArguments()[ 0 ];

      SetText( newValue );
    }

    #endregion //ItemsSource

    #region IsReadOnly

    public static readonly DependencyProperty IsReadOnlyProperty =
        DependencyProperty.Register( "IsReadOnly", typeof( bool ), typeof( PrimitiveTypeCollectionControl ), new UIPropertyMetadata( false ) );

    public bool IsReadOnly
    {
      get { return ( bool )GetValue( IsReadOnlyProperty ); }
      set { SetValue( IsReadOnlyProperty, value ); }
    }

    #endregion //IsReadOnly

    #region ItemsSourceType

    public static readonly DependencyProperty ItemsSourceTypeProperty = DependencyProperty.Register( "ItemsSourceType", typeof( Type ), typeof( PrimitiveTypeCollectionControl ), new UIPropertyMetadata( null ) );
    public Type ItemsSourceType
    {
      get
      {
        return ( Type )GetValue( ItemsSourceTypeProperty );
      }
      set
      {
        SetValue( ItemsSourceTypeProperty, value );
      }
    }

    #endregion ItemsSourceType

    #region ItemType

    public static readonly DependencyProperty ItemTypeProperty = DependencyProperty.Register( "ItemType", typeof( Type ), typeof( PrimitiveTypeCollectionControl ), new UIPropertyMetadata( null ) );
    public Type ItemType
    {
      get
      {
        return ( Type )GetValue( ItemTypeProperty );
      }
      set
      {
        SetValue( ItemTypeProperty, value );
      }
    }

    #endregion ItemType

    #region Text

    public static readonly DependencyProperty TextProperty = DependencyProperty.Register( "Text", typeof( string ), typeof( PrimitiveTypeCollectionControl ), new UIPropertyMetadata( null, OnTextChanged ) );
    public string Text
    {
      get
      {
        return ( string )GetValue( TextProperty );
      }
      set
      {
        SetValue( TextProperty, value );
      }
    }

    private static void OnTextChanged( DependencyObject o, DependencyPropertyChangedEventArgs e )
    {
      PrimitiveTypeCollectionControl primitiveTypeCollectionControl = o as PrimitiveTypeCollectionControl;
      if( primitiveTypeCollectionControl != null )
        primitiveTypeCollectionControl.OnTextChanged( ( string )e.OldValue, ( string )e.NewValue );
    }

    protected virtual void OnTextChanged( string oldValue, string newValue )
    {
      if( !_surpressTextChanged )
        PersistChanges();
    }

    #endregion //Text

    #endregion //Properties

    #region Constructors

    static PrimitiveTypeCollectionControl()
    {
      DefaultStyleKeyProperty.OverrideMetadata( typeof( PrimitiveTypeCollectionControl ), new FrameworkPropertyMetadata( typeof( PrimitiveTypeCollectionControl ) ) );
    }

    public PrimitiveTypeCollectionControl()
    {
    }

    #endregion //Constructors

    #region Overrides


#endregion

    #region Methods

    private void PersistChanges()
    {
      IList list = ComputeItemsSource();
      if( list == null )
        return;

      IList items = ComputeItems();

      //the easiest way to persist changes to the source is to just clear the source list and then add all items to it.
      list.Clear();

      int counter = 0;
      foreach( var item in items )
      {
        if( list is Array )
        {
           ( ( Array )list ).SetValue( item, counter++);
        }
        else
        {
          list.Add( item );
        }
      };

      // if something went wrong during conversion we want to reload the text to show only valid entries
      if( _conversionFailed )
        SetText( list );
    }

    private IList ComputeItems()
    {
      IList items = new List<object>();

      if( ItemType == null )
        return items;

      string[] textArray = Text.Split( '\n' );

      foreach( string s in textArray )
      {
        string valueString = s.TrimEnd( '\r' );
        if( !String.IsNullOrEmpty( valueString ) )
        {
          object value = null;
          try
          {
            if( ItemType.IsEnum )
            {
              value = Enum.Parse( ItemType, valueString );
            }
            else
            {
              value = Convert.ChangeType( valueString, ItemType );
            }
          }
          catch
          {
            //a conversion failed
            _conversionFailed = true;
          }

          if( value != null )
            items.Add( value );
        }
      }

      return items;
    }

    private IList ComputeItemsSource()
    {
      if( ItemsSource == null )
      {
        // Save current text since creating the ItemsSource will reset it
        string currentText = this.Text;
        ItemsSource = CreateItemsSource();
        this.Text = currentText;
      }

      return ItemsSource;
    }

    private IList CreateItemsSource()
    {
      IList list = null;

      if( ItemsSourceType != null )
      {
        ConstructorInfo constructor = ItemsSourceType.GetConstructor( Type.EmptyTypes );
        list = ( IList )constructor.Invoke( null );
      }

      return list;
    }

    private void SetText( IEnumerable collection )
    {
      _surpressTextChanged = true;
      StringBuilder builder = new StringBuilder();
      foreach( object obj2 in collection )
      {
        builder.Append( obj2.ToString() );
        builder.AppendLine();
      }
      Text = builder.ToString().Trim();
      _surpressTextChanged = false;
    }

    #endregion //Methods
  }
}
